How to preparation pottassim dichromate from iron chromite ore?
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Potassium dichromate is prepared from chromite ore (FeCr2O4) in the following steps. Potassium dichromate being less soluble than sodium chloride is obtained in the form of orange coloured crystals and can be removed by filtration. The dichromate (Cr2O2-7) ion exists in equilibrium with chromate (CrO2-4) ion at pH 4.
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